No, I mean, how would you know it won't cause damage. Every kid responds differently to the "treatment", and how do you ensure parents do it "sparingly".
Sparingly would be only a few swats. As soon as the child feels pain and knows why they are feeling it - they misbehaved.
Once they make the association, the act is done and anything further is abusive. Save the extra spankings for the next time they misbehave.
Physical damage is negligible since it's just a swat. If you're actually causing lasting damage, the spanking is being done wrong.
Psychological, this is why it's important to reward kids as well as establish that you do in fact love them. Excessive punishment comes off as abuse; excessive reward comes off as spoiling; striking a balance would logically make them well-rounded. Punished enough to know there are limits, rewarded enough to know that good will is earned, not given.
So was I, by the way. Not the "good" kind, though; I got the kind your cousin's half sister got. So you know where I'm coming from.
Indeed, that's a brutal form of spanking to me. You only need a few swats to get the desired effect - the child now knows what will happen if it does the bad thing again.
Just the threat of spanking is ominous after the first time, so that's a tool of discipline in and of itself.
Pain is a last resort; normally raising your voice is enough to set the kid in line. But if they don't seem to understand "Don't do this" you need to give incentive.
I hate to use anecdotes, but let's go back to my youth. I would often dunk my cousins and siblings when we swam. I was given a timeout. It would take a few tries to get the point across, but it did. Fortunately, if this works for most children, things such as spanking are not required - time outs generally do the job.
So, the infliction of pain upon a child's rear end is really what you use when the other methods have not worked.
If you have to resort to violence to teach your kids something then you probably shouldn't be a parent.
Pain is a language every animal, no matter how intelligent or lack thereof, understands.
For older children, simply taking away toys will suffice. But for younger ones, a light spanking gets the point across.
Now normally, you should be able to scare a child straight just with your voice. But if that fails...